56334 Mercruiser GROMMET

Table 1
Troubleshooting Test Steps Values Results
1. Extended Idle Times
A. Extended idle times will allow oil to pass into the exhaust system. Refer to Operation and Maintenance Manual, Operation Section.
Idle times
Result The idle times are extensive.
Reduce the idle times.
Result The idle times are not extensive.
Proceed to Test Step 2.
2. Engine Crankcase Breather
A. Check the engine crankcase breather for blockage or restrictions.
B. Check for excessive oil from the outlet of the breather.
C. Check that the application has not been operated above the recommended gradient.
D. Check if the Oil Mist Separator drain hose is fitted using correct orientation (white mark facing OMS drain spigot).
E. Check to see whether an OMS filter is fitted.
Breather
Result: The engine crankcase breather is blocked or restricted.
Repair: Clear the blockage or restriction.
Result: Excessive oil is ejected from the outlet of the breather.
Repair: Investigate the cause of the excessive oil content in the breather flow. Check that the engine has been serviced in line with the recommended maintenance intervals. Refer to Operation and Maintenance Manual, if above 1500 hours, change the crankcase breather filter. Refer to Operation and Maintenance Manual, Crankcase Breather (Canister) - Replace.
Note: Some oil presence from the breather is normal.
Proceed to Test Step 3.
Result: Little or no oil is ejected through the breather.
Repair: Clean oil from hoses and re-test.
Proceed to Test Step 3.
3. Turbocharger
Note: The turbocharger that is installed on this engine is a non-serviceable item. If any mechanical fault exists, the turbocharger must be replaced.
A. Check that the oil drain for the turbocharger is not blocked or restricted.
B. Check the turbocharger for evidence of an internal oil leak.
C. Check that the compressor housing for the turbocharger is free of dirt and debris. Makes sure that the housing is not damaged.
D. Check that the turbine housing for the turbocharger is free of dirt and debris. Makes sure that the housing is not damaged.
E. Check that the turbine blades rotate freely in the turbocharger.
Turbocharger
Result: The oil drain for the turbocharger is blocked or restricted.
Repair: Remove the blockage or restriction. If necessary, replace the oil drain line.
Result: The turbocharger has an internal oil leak.
Repair: Replace the turbocharger.
Check that the repairs have eliminated the faults.
Result: The turbocharger is OK.
Proceed to Test Step 4.
4. Worn Valve Guide Seals or Faulty Valve Guide Seals
A. Inspect the valve guide seals for wear and for damage.
Valve guide seals
Result: The valve guide seals are damaged.
Repair: Replace the valve guide seals. Verify the repair.
Result: The valve guide seals are not damaged.
Proceed to Test Step 5.
5. Worn Valve Guides
A. Inspect the valve guides for wear. Refer to the Specification manual for the maximum permissible wear of the valve guides.
Valve guides
Result: The valve guides are worn.
Repair: If necessary, recondition the cylinder head. Verify the repair.
Result: The valve guides are not worn.
Proceed to Test Step 6.
6. Worn Piston Rings
A. Remove the pistons. Refer to Disassembly and Assembly, "Pistons and Connecting Rods - Remove".
B. Remove the piston rings from the pistons. Refer to Disassembly and Assembly, "Pistons and Connecting Rods - Disassemble"
C. Inspect the pistons and piston rings for wear or damage. Refer to the "Specifications" manual for further information.
Piston rings
Result The piston rings are worn.
Repair: Replace the piston rings. Verify the repair.
Result The piston rings are not worn.
Proceed to Test Step 7.
7. Clean the Fuel System
A. Following the instructions on the bottle, add Caterpillar Fuel System Cleaner 343-6210 to the fuel tank.
Electronic Unit Injectors
Result: Performance should be restored within 2-3 hours.
Return the unit to service, the fuel system will be cleaned during operation.
Result: Performance is not restored within 2-3 hours.
Contact the Dealer Solutions Network (DSN).